公开(公告)号：US20190380813A1

公开(公告)日：2019-12-19

申请号：US16489594

申请日：2018-03-08

Applicant: J. MORITA MFG. CORP.

Inventor： Kyohei Kato ,  Naoki Katsuda ,  Seiichiro Yamashita ,  Kazunari Matoba

IPC: A61C5/44 ,  A61C1/06 ,  A61C1/00 ,  A61C19/04

Abstract: The A root canal treatment apparatus includes: a handpiece configured to hold a cutting tool in a head in a drivable manner; a motor driver and a micromotor configured to drive the cutting tool; a root canal length measurement circuit; and a control portion. The root canal length measurement circuit is configured to electrically detect a position of a tip end of the cutting tool in a root canal, using the cutting tool as a measuring electrode. The control portion is configured to perform drive for reversely rotating the cutting tool by a predetermined set angle (180 degrees) when the position of the tip end of the cutting tool detected by the root canal length measurement circuit reaches a predetermined set position, and then, stopping rotation.

公开(公告)号：US11801118B2

公开(公告)日：2023-10-31

申请号：US16604342

申请日：2018-08-09

Applicant: J. MORITA MFG. CORP.

Inventor： Kyohei Kato ,  Naoki Katsuda ,  Kazunari Matoba

IPC: A61C5/42 ,  A61C1/00 ,  A61C1/06

CPC classification number: A61C5/42 ,  A61C1/003 ,  A61C1/0023 ,  A61C1/06

Abstract: A dental treatment apparatus includes a handpiece holding a cutting tool in its head, a drive portion driving the cutting tool held by the head, and a control portion controlling the drive portion in accordance with a drive sequence. The drive sequence includes at least one forward rotation drive for rotating the cutting tool in a cutting direction to cut a treatment portion and at least one reverse rotation drive for rotating the cutting tool in a non-cutting direction. Under the control of the drive portion in accordance with the drive sequence, a cumulative amount of rotation which is an accumulation of an amount of rotation in forward rotation drive and an amount of rotation in reverse rotation drive does not exceed a set value at any time point.

公开(公告)号：US20200155273A1

公开(公告)日：2020-05-21

申请号：US16604342

申请日：2018-08-09

Applicant: J. MORITA MFG. CORP.

Inventor： Kyohei Kato ,  Naoki Katsuda ,  Kazunari Matoba

IPC: A61C5/42 ,  A61C1/00 ,  A61C1/06

Abstract: A dental treatment apparatus includes a handpiece holding a cutting tool in its head, a drive portion driving the cutting tool held by the head, and a control portion controlling the drive portion in accordance with a drive sequence. The drive sequence includes at least one forward rotation drive for rotating the cutting tool in a cutting direction to cut a treatment portion and at least one reverse rotation drive for rotating the cutting tool in a non-cutting direction. Under the control of the drive portion in accordance with the drive sequence, a cumulative amount of rotation which is an accumulation of an amount of rotation in forward rotation drive and an amount of rotation in reverse rotation drive does not exceed a set value at any time point.